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F. SCHWARZER. LIFTING JACK. APPLICA'HGH men 05c. 31. I918.

1,304,515. Patented May 20, 1919.

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FRITZ SCHWARZER, OF ST.

GALLEN, SWITZERLAND.

LIFTING-JACK.

Specification of Letters Patent.

Application'filed December 31, 1918. Serial No. 269,111.

struction in which the weight sustaining member is stepwise lifted bythe pumping action of a detachably and is retained in its automaticallyacting spring member, latter for the purpose of letting down the weightsustaining me ber is actuated preferably by the detached hand lever andcanbe permanently retained in non-operative position by specialmechanism, as will now be described in detail in connection with theaccompanying drawing, in which Figure 1 represents a side elevation ofthe device, partly in section, and Fig. 2 is a plan view thereof, thesame reference numerals denoting like parts in the two figures.

The standard 1, rising vertically from the base 2, is strengthened byribs 3 and presents a housing of oblong cross-section in which acorrespondingly shapedweig-ht sustaining member 4 can freelyreciprocate.. The latter member has a preferably rounded lower end 5 andsupports at its upper end a member adapted to cooperate with the objectto be lifted. As shown, this member is in the shape of a pointed pin 6,but it may, obviously, also be in any other form, for instance in thatof a cradle to fit the wheel hub hinged hand lever relative position byan which .or other part to be lifted. The weight sustaining member isprovided at the two opposite narrow faces with rows of downwardlyinclined rack teeth 7 and 8 respectively. In the front narrow wall 9 ofthe standard is provided a slot 10 and above the latter the wall isthickened to form a channeled bearing bracket 11. For liftinglyoperating the rack member 4 there is provided a hand lever 12, the innerend of which extends through the wall slot 10 and is designed to coactwith its pointed extremity 12 with the row of feed teeth 7 as clearlyshown in Fig. 1. The outer lever end is rectangularly bent-off, as at13, to serve a special purpose to be described farther on. The liftinglever 12 is normally suspended from the bearing bracket 11 by means of ashackle or elongated loop member 14, so that it can readily be attachedto or detached from the standard and can be pumpingly operated in themanner of a double-armed lever with the horizontal portions of the loopmember serving as pivots. On the opposite standard wall near the upperend are provided laterally extending cheeks 15, and its upper rim is cutaway to some extent, as at '16. A strong flat spring 17 is secured tothe standard at its lower end by a bolt 18-, which passes freely througha bore in the spring and carries between the latter and its flange head19 a relatively stiff compression spring 20. In its upper portion theflat spring 17 is guided between the cheeks 1 5 and its upper extremity17 is rectangularly inwardly bent and extends through the rim notch .16into the domain of the rack teeth 8, so that normally the weightsustaining member is supported and relatively locked by this anglespring 17. r

The raising as well as the locking mechanisms, obviously, operate. inthe manner of pawl and ratchet devices. 7

In operation the jack is placed beneath the automobile or other objectto belifted and itsrack membera is forced up toothwise by pumpinglymanipulating the hand lever, each such pumping oscillation raising therack member the distance of one feed tooth 7 and the angle spring 17alternately recedingly and supportingly cooperating with the ratchetteeth 8. so that the weight sustaining member will always be under theoperative action of the angle spring, on the forward and on the returnstroke of the lifting lever and even if the latter is removed entirely.

The lowering of the load can be obtained in two different ways. In casethe load on the rack member is relatively light, the lifting lever is'unhooked from the bracket 11,

its angle end 13 is inserted between the standard and the lock springsomewhat below the cheeks 15, and the lever is then laid over in upwardor downward direction, when the lock spring will be forced to recedefrom out of the rack teeth 8, with the result that the rack member isnow free to drop down into the standard.

If the supported load is great then the lock spring may be forced out ofoperative contact with the rack teeth 8 by any suitable tool, notspecially shown, or even by hand,

Patented May20, 1919.

respective tooth 8.

while the lifting lever remains in operative contact with the feedteeth. By pressing down on the free end of the hand lever the rackmember is to be lifted just a little so that the lock spring head iseased and can readily be Withdrawn from underneath the The rack memberis then letdown step by step, the respective vertically oscillatorymovements of the lifting ever alternating with horizontallyreciprocat-ory movements of the lock spring, so that every time thelifting lever is disengaged from the rack tooth just lowered forengaging beneath the next upper tooth, the sup port or lock spring isallowed to move forward to support and lock the rack member until thepoint of the lifting lever has again caught hold of the rack andsupports its weight.

For moving and retaining the lock spring out of cooperation with therack member for any length of time, it is pushed back on its securingbolt 18 against the action of the helical spring 20 far enough to recedebeyond the outer edge of the check 15 and is t en swung over sidewise.

lVhat I claim is:

In a lifting jack, in combination, an oblong hollow standard having slotin the one narrow wall, and a bracket upper end above said wall slot; aweight sustalning member operatively fitting the hollow of saidstandard, rows of ratchetteeth on the opposite narrow faces of saidweight sustaining member; means for stepwise raising said weightsustaining member relative to said standard comprising a clou- Gopies ofthis patent may be obtained for five cents each,

bent-off portion designed to cooperate With for permanently keeping saidlock spring out of operative contact with said weight sustaining membercomprising guide cheeks extending from said standard, a bolt threadinginto the standard and passing freely through said lock spring, a flangehead to said bolt, and a helical compression spring surrounding saidbolt and interposed between said lock spring and said bolt head for thelock spring pressed against the standard, but with capability ofallowing the lock spring under outwardly directed pressure to reoede farenough on its retaining bolt to be swung sidewise clear of the guidecheeks.

FRITZ SGI-IWARZER.

by addressing the Commissioner of Patents.

Washington, D. O."

